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You searched for: creator:"Amos P. Brown and Frederick Ehrenfeld"
[texts]Minerals of Pennsylvania; Topographic and Geologic Survey of Pennsylvania, Report No. 9; 1913 - Amos P. Brown and Frederick Ehrenfeld
Topographic and Geologic Survey of PennsylvaniaRichard R. Rice, State GeologistReport No. 9Harrisburg, PAWM. Stanley Ray, State Printer1913
Keywords: Mines and mineral resources Pennsylvania
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